Mathematics High School

An equilateral triangle with side length 9 cm is shown in the diagram, work out the area of the triangle.
Give your answer rounded to 1 DP.

Answers

Answer 1

The answer is 35.1 cm².

Hope this helps; have a great day!

Answer 2

Question:-

Find the area of an equilateral triangle with side length = 9cm correct upto one decimal place.

_______________________________________________

Solution:-

In an equilateral triangle all sides are equal.

Let s = side length = 9 cm

Then, area of equilateral triangle is given as:

A = (√3/4)s²

Putting the value of s here,

A = (√3/4) * (9 cm)²

=> A = (√3/4) * 81 cm²

=> A = √3 * 20.25 cm²

We know that, √3 = 1.732

=> A = 1.732 * 20.25 cm²

=> A = 35.073 cm²

Rounding to one decimal place,

=> A = 35.1 cm²

_______________________________________________

Related Questions

Kaylee and her friends are going into a bakery. How much would it cost to buy 1 donut and 5 cookies if each donut costs $2.00 and each cookie costs $1.25? How much would it cost to buy 11 donuts and 55 cookies if each donut cost \$d$d and each cookie cost \$c?$c?

I need the work as well

Answers

Answer:

$90.75

Step-by-step explanation:

$2 (for each donut) x 11 (the number of donuts they want

=22

Then

$1.25(for each cookie) x 55 (the number of cookie they want)

=$68.75 +$22

=90.75

Please Help ! ill give you brainlist pleaseeee i don't wanna fail I wanna make my mom proud please .

Answers

Answer: 1) 8x + 2 = 90 1a. 11 2. 13x-10= 133 2a. 11

Both solve for 11.

Step-by-step explanation: 1) they’re both the same measure so they equal each other

Subtract 2 from each side 8x = 88 and x is 11

13x - 10 = 133 they’re both the same measures so they equal each other.

Add 10 to both sides because it’s already negative and 13x = 143 and you get 11

Answer:

11 for both

Step-by-step explanation:

simplify √7/18 please help

√14/7

√14/6

√6/14

Answers

Answer:

14/6

Step-by-step explanation:

Find the value of x and y in the given parallelogram

Answers

Answer:

Step-by-step explanation:

9y-4 = 50

9y = 54

y= 6

9y-4+7x+xy = 180

9(6)-4+7x+6x= 180

54-4+13x = 180

13x+50 = 180

13x = 130

x = 10

EXPLAIN YOUR WORK PLZ

AJ worked 48 hours last week. He earns $15.40 per hour plus overtime, at the usual rate, for hours exceeding 40 hours. What was his gross pay?
A $644.80
B$739.20
C$800.80
D$1,108.80
​

Answers

Answer:

D

Step-by-step explanation:

It will be $1,108.0 Because if you devide 40 by the hours, Plus the pay which is 15.40 You will get D

Solve for g
–0.3g + 2.86 = –7.41 − 8.2g

Answers

Answer:

g= -1.3

hope this helps

Answer:

g= -1.3

Step-by-step explanation:

Includes pics

Use the image to answer the question below.

Which equation best represents circle A?

Answers

Answer: the answer is A

Step-by-step explanation:

Michelle wrote a total of 12 pages over 3 hours. How many hours will Michelle have to spend
writing this week in order to have written a total of 20 pages? Assume the relationship is
directly proportional.
hours

Answers

Answer:

5 Hours

Step-by-step explanation:

12/3 = 4 . 3/3 = 1

4,8,12,16,20

1,2,3,4,5

1 Hour = 4 Pages

2 Hours = 8 Pages

3 Hours = 12 Pages

4 Hours = 16 Pages

5 Hours = 20 Pages

Rectangle A'B'C'D' is a dilation of rectangle ABCD.'
What is the scale factor?
Enter your answer in the box.
I need help ASAP!

Answers

Answer:

4 is your answer

Step-by-step explanation:

What is the solution set for x > -1

Answers

Answer:

Whole number set

Step-by-step explanation:

x > -1 means grater than (-1)

x = {0 ,1,2,3 ......}

1. 2x - 8 when x = 3





2. 45 - (4 . y) when y = 5





3. 32 + 2g -7 when g = 4

Answers

Answer:

2(3)-8

=-2

45-4.5

=40.5

32+2(4)-7

=33

Answer:

1.x37

2.66y

3.59g

Step-by-step explanation:

so you divied and subtract

you do the same

but add for the last

What is the circumference of the following circle when diameter = 9 cm

Answers

Answer:

The answer is C≈28.27cm

Step-by-step explanation:

Using the formulas

C=2πr

d=2r

Solving for C

C=πd=π·9≈28.27433cm

Answer:

diameter of 9

radius 4.5

4.5 x 3.14= 14.13

ignore this- the other person got it right. I messed up and can't delete it. Sorry!

Can someone please help

Answers

Answer:

b

Step-by-step explanation:

it might be wrong tho-

PLEASE GEOMETRY HELP WILL MARK BRAINLIEST!!!

Answers

Answer:

Step-by-step explanation:

⅔n - 5 = ⅓n + 7

⅓n = 12

n = 36

I need help. Please give THE RIGHT ANSWER

Answers

the answer is in the pic


What is the volume of the cone in the diagram

Answers

It would be 28 Correct me if wrong

What are the distances from the point (x,y) to the focus of the parabola and the directrix, select two answers

Answers

Answer:

3,5

Step-by-step explanation:

axis

I need help on this homework

Answers

Linear, 4 is added each time.
Line 4
Explanation
Period

solve the following equation -3(3 + 6b) = 36 +3b

Answers

Answer:

Exact Form:

b=-5/7

Decimal Form:

b=-2.142857

Mixed Number:

b=-2 1/7

please help with my geometry & a step by step

Answers

Answer: 42.53

Step-by-step explanation:

iok so because we are give the two sides 19 and 14 from here we need to determine what they are concidered. 19 is on the hypotenuse, and 14 is on the adjacent. from this, we can use Soh cah toa, we are looking for h and a which gives us cah which is cosine, now we imput this into our calculator

Cos-1(14/19) this should then give you 42.53 :) hope this helps

plssss help meeee it's due today​

Answers

Answer: use math papa.com

Step-by-step explanation:

Question

Find the difference. Type your answer in standard form

[tex](5n - 2) - (3n - 8) \\answer = 2n + 6[/tex]

what's a real world scenario that would use sine to solve?

Answers

Answer:

Radio waves, tides, musical tones, electrical currents

Sine and cosine functions can be used to model many real-life scenarios – radio waves, tides, musical tones, electrical currents.

You have the option to deposit $6500 into an account that pays 3.25% interest, compounded quarterly OR to deposit your money into an account that pays the same interest rate but compounds continuously. Which option yields you more money after 5 years and how much more?

Answers

Answer:

Step-by-step explanation:

Plug in the giving information, P = 4000, r = 0.06, n = 4,

and t = 5.

Use the order or operations to simplify the problem. If the

problem has decimals, keep as many decimals as possible

until the final step.

FV = 5387.42  Round your final answer to two decimals places.

Can anyone help me with this?

Answers

Answer:

307.5

Explanation:

First 65 x 10.50 then 990-682.5

If x = 3 units, y = 6 units, and h = 5 units, find the area of the parallelogram shown above using decomposition.

Answers

Answer:

C. 30 square units

Step-by-step explanation:

Sana makatulong

Can someone help me with this? But also explain how they got the answer so I understand

Answers

Answer:

(4,2)

Step-by-step explanation:

So proportional means that it is the same rate. I believe it is (4,2) because from 4 to eight is 4 and from 2 to 6 is also 4 and there for it is proportional.

please help me I'm really behind​

Answers

Answer:

50.24

Step-by-step explanation:

4 = radius

To get the diameter you need to multiply the radius by two  4 x 4 = 16 use 3.14 =  3.14 x 16 =  50.24 THERE IS THE ANSWER!!!!

Catch up btw

Answer:

rtgfg

fdudh. just ucufjvivifiicuj. 8 coccucicciciu I o

Kendra washes windows in an office building. She washes 25 of the windows on Monday. She washes 13 of the windows on Tuesday. What fraction of the windows remain for Kendra to wash?

Answers

Answer:

4/15

Step-by-step explanation:

HELP PLZ AGAIN. Same material. It is still timed. Will give 75 pts and brainly. This is vital to my math grade. Time is on the essence and my math grade is at stake if I do not pass this. I need Slope Intercept form for the equation. HELP HELP HELP PLZ.

Answers

Answer:

m= (-9+5)/5-3

Step-by-step explanation:

I just learned this and the equation is

m=(y2-y1)/x2-x1

so good luck brotha

Answer:

b(y-intercept)=(0,1) and M(slope)=-2

Step-by-step explanation:

use the slop formula and the slope intercept form to find the slope and y intercept. slope -2. y-intercept (0,1)

with that information, the equation would be y=mx+b. y=-2x+(0,1)

I need help pleaseee​

Answers

Answer:

x is 103 cause it is opposite angles and y is 77 180-103 hope this helps you

Answer: x=103° y=77°

Step-by-step explanation:

Opposite angles are always the same so, as x is opposite to 103°, it would be 103° too.

To work out what y is you would have to do 180-103=77°. The reason why is because angles on a straight line always add up to 180° and you can see that 103° and y are on the same line.

Hope this helps :)

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